Eaton EBR-3000/EBR-Z Eaton high impedance bus differential relay

Applications

• Three phase high impedance bus differential protection for switch

gear .

• Three phase differential protection of transformers, generators,

motors, etc .

• Restricted earth fault protection for grounded-wye windings or

balanced earth fault protection

Protection functions

• Differential protection (87)

• Open CT circuit (87SV)

Metered values

• Differential voltage readings

• Differential voltage phase angles

Fault and waveform monitoring

• Trip circuit monitoring1

• Fault data logs (up to 20 events)

• Sequence of event recorders (up to 300 events)

• Waveform capture (7.200 cycles total, customized file size)

Control functions

• Programmable I/O

• Programmable LEDs

• Multiple setting groups (up to 4)

Communication (note 1)

• Local HMI

• Front USB communication port

• Remote communication port

• RS-485 terminals

• Ethernet RJ45

• Fiber optic ST

• RS-485 D-SUB

• LC duplex fiber optic

• IRIG-B

• Protocols

• Modbus RTU

• Modbus TCP

• IEC 61850 (MMS and GOOSE)

• DNP3-RTU

• DNP3-TCP/UDP

• Profibus-DP

Physical characteristics

EBR-3000 and EBR-Z mounted individually:

• Height: 8 .62 in . (219 mm)

• Width: 6 .82 in . (173 mm)

EBR-3000 and EBR-Z mounted together:

• Height: 8 .62 in . (219 mm)

• Width: 12 .5 in . (317 .5 mm)

• Depth: 7 .5 in . (190 mm), 5 .56 in* (141 mm*)

* Depth behind panel with projection mounted enclosure

Listings/certification

• UL, CSA, CE

General description

The EBR-3000 relay, combined with an EBR-Z (EBR-3Z), is a digital

protection relay designed for high impedance differential protection

schemes . The intuitive operating system with validation checks and

extensive commissioning functions such as the built-in fault simula

tor allow safe and time-optimized maintenance and commissioning .

The parameter setting and evaluation software PowerPort-E can be

used consistently across the entire family of E-Series relays .

The principle of the high impedance differential protection is compa

rable with low impedance differential protection: Calculate and moni

tor the sum of all the currents flowing into the protected object, and

under non-fault conditions the sum is zero . Any differential current,

however, is forced through the high impedance of the high imped

ance relay .

The input of the high impedance relay consists of a resistance

(EBR-Z) and an overcurrent protection element (ANSI 87 in the EBR

3000) .

The following convention is important to know: Even though the

EBR-3000 measures the currents flowing through the stabilizing

resistor, all the measurements are presented as a voltage across

this stabilizing resistor (which is 2000 Ω for the EBR-Z) . The burden

of the EBR-3000 measuring input (which is in series with the EBR-Z

resistor) can be neglected compared to the 2000 Ω impedance .

The EBR-3000 monitors the magnitude of this voltage to differenti

ate between in-zone and through faults .

A varistor is built into the EBR-Z . It is connected across the input of

the relay to avoid damage to the relay caused by high voltage . The

varistor needs to be able to conduct significant power as the paral

leled CTs deliver current under special fault circumstances (e . g . in

case of a breaker failure) for more than 30 cycles .

To prevent damage to the relay due to system issues, a lockout relay

is required to short-circuit the high impedance when an trip is initi

ated .